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<h3>

Ben Gamari pushed to branch wip/T18079

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b">de4c785c</a></strong>

<div>

<span>by Ben Gamari</span>

<i>at 2020-04-24T18:27:29-04:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta expand un-saturated primops

Now since we no longer try to predict CAFfyness we have no need for the

solution to #16846. Eta expanding unsaturated primop applications is

conceptually simpler, especially in the presence of levity polymorphism.

This essentially reverts cac8dc9f51e31e4c0a6cd9bc302f7e1bc7c03beb,

as suggested in #18079.

Closes #18079.

</pre>

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<h4>7 changed files:</h4>

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<a href="#a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd">

compiler/GHC/Builtin/PrimOps.hs

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<a href="#11e6f6a348be9920cecad0893a25350137524b4f">

compiler/GHC/ByteCode/Linker.hs

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<a href="#d79a8a61508cb6c5f38a23ab2b691bb77306f672">

compiler/GHC/CoreToStg.hs

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<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">

compiler/GHC/CoreToStg/Prep.hs

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<a href="#20aaf8344f379f354fe31dd0c1c4db4ddc5b17aa">

compiler/GHC/Types/Id.hs

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<a href="#6fa7e3addcbfb51484d3c10c0e9f76b940dc43bb">

testsuite/tests/codeGen/should_fail/T13233.hs

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<a href="#099b526cfec5ec31d3d6df51fb073d7d9627cc39">

testsuite/tests/codeGen/should_fail/T13233.stderr

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<h4>Changes:</h4>

<li id="a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd"><strong>compiler/GHC/Builtin/PrimOps.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -590,33 +590,85 @@ primOpOcc op = case primOpInfo op of</td>

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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Primop wrappers]</span></span>

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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<td class="diff-line-num new_line old" data-linenumber="593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Previously hasNoBinding would claim that PrimOpIds didn't have a curried</span></span>

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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function definition. This caused quite some trouble as we would be forced to</span></span>

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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eta expand unsaturated primop applications very late in the Core pipeline. Not</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only would this produce unnecessary thunks, but it would also result in nasty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

597

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<td class="diff-line-num new_line old" data-linenumber="593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inconsistencies in CAFfy-ness determinations (see #16846 and</span></span>

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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CAFfyness inconsistencies due to late eta expansion] in GHC.Iface.Tidy).</span></span>

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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, it was quite unnecessary for hasNoBinding to claim this; primops in</span></span>

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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fact *do* have curried definitions which are found in GHC.PrimopWrappers, which</span></span>

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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is auto-generated by utils/genprimops from prelude/primops.txt.pp. These wrappers</span></span>

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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are standard Haskell functions mirroring the types of the primops they wrap.</span></span>

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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For instance, in the case of plusInt# we would have:</span></span>

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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"></span>

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<td class="diff-line-num new new_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To support (limited) use of primops in GHCi genprimopcode generates the</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.PrimopWrappers module. This module contains a "primop wrapper"</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">binding for each primop. These are standard Haskell functions mirroring the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types of the primops they wrap. For instance, in the case of plusInt# we would</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

598

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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have:</span></span>

</pre>

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605

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599

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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"></span>

</pre>

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606

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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    module GHC.PrimopWrappers where</span></span>

</pre>

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607

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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    import GHC.Prim as P</span></span>

</pre>

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602

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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    plusInt# :: Int# -> Int# -> Int#</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    plusInt# a b = P.plusInt# a b</span></span>

</pre>

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609

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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"></span>

</pre>

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610

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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We now take advantage of these curried definitions by letting hasNoBinding</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">claim that PrimOpIds have a curried definition and then rewrite any unsaturated</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PrimOpId applications that we find during CoreToStg as applications of the</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">associated wrapper (e.g. `GHC.Prim.plusInt# 3#` will get rewritten to</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`GHC.PrimopWrappers.plusInt# 3#`).` The Id of the wrapper for a primop can be</span></span>

</pre>

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615

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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">found using 'PrimOp.primOpWrapperId'.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="616" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The Id for the wrapper of a primop can be found using</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="607" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'GHC.Builtin.PrimOp.primOpWrapperId'. However, GHCi does not use this mechanism</span></span>

</pre>

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608

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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to link primops; it rather does a rather hacky symbol lookup (see</span></span>

</pre>

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609

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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.ByteCode.Linker.primopToCLabel). TODO: Perhaps this should be changed?</span></span>

</pre>

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610

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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"></span>

</pre>

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611

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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that these wrappers aren't *quite*</span></span>

</pre>

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612

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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as expressive as their unwrapped breathern in that they may exhibit less levity</span></span>

</pre>

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613

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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">polymorphism. For instance, consider the case of mkWeakNoFinalizer# which has</span></span>

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614

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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type:</span></span>

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615

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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"></span>

</pre>

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616

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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    mkWeakNoFinalizer# :: forall (r :: RuntimeRep) (k :: TYPE r) (v :: Type).</span></span>

</pre>

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617

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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                          k -> v</span></span>

</pre>

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618

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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       -> State# RealWorld</span></span>

</pre>

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619

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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       -> (# State# RealWorld, Weak# v #)</span></span>

</pre>

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620

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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"></span>

</pre>

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621

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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Naively we could generate a wrapper of the form,</span></span>

</pre>

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622

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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"></span>

</pre>

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623

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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"></span>

</pre>

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624

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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    mkWeakNoFinalizer# k v s = GHC.Prim.mkWeakNoFinalizer# k v s</span></span>

</pre>

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625

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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"></span>

</pre>

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626

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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, this would require that 'k' bind the levity-polymorphic key,</span></span>

</pre>

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627

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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is disallowed by our levity polymorphism validity checks (see Note</span></span>

</pre>

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628

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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Levity polymorphism invariants] in GHC.Core). Consequently, we give the</span></span>

</pre>

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629

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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">wrapper the simpler, less polymorphic type</span></span>

</pre>

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630

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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"></span>

</pre>

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631

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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    mkWeakNoFinalizer# :: forall (k :: Type) (v :: Type).</span></span>

</pre>

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632

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                          k -> v</span></span>

</pre>

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633

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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       -> State# RealWorld</span></span>

</pre>

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634

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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       -> (# State# RealWorld, Weak# v #)</span></span>

</pre>

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635

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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"></span>

</pre>

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636

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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This simplification tends to be good enough for GHCi uses given that there are</span></span>

</pre>

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637

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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">few levity polymorphic primops and we do little simplification on interpreted</span></span>

</pre>

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638

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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">code anyways.</span></span>

</pre>

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639

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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"></span>

</pre>

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640

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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TODO: This behavior is actually wrong; a program becomes ill-typed upon</span></span>

</pre>

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641

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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">replacing a real primop occurrence with one of its wrapper due to the fact that</span></span>

</pre>

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642

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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the former has an additional type binder. Hmmm....</span></span>

</pre>

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643

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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"></span>

</pre>

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644

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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding primops]</span></span>

</pre>

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645

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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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646

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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"></span>

</pre>

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647

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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STG requires that primop applications be saturated. This makes code generation</span></span>

</pre>

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648

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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">significantly simpler since otherwise we would need to define a calling</span></span>

</pre>

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649

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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">convention for curried applications that can accomodate levity polymorphism.</span></span>

</pre>

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650

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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To ensure saturation, CorePrep eta expands expand all primop applications as</span></span>

</pre>

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652

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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described in Note [Eta expansion of hasNoBinding things in CorePrep] in</span></span>

</pre>

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653

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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Prep.</span></span>

</pre>

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654

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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Historical Note:</span></span>

</pre>

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656

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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For a short period around GHC 8.8 we rewrote unsaturated primop applications to</span></span>

</pre>

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658

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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather use the primop's wrapper (see Note [Primop wrappers] in</span></span>

</pre>

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659

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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Builtin.PrimOps) instead of eta expansion. This was because at the time</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="660" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

660

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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CoreTidy would try to predict the CAFfyness of bindings that would be produced</span></span>

</pre>

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661

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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by CorePrep for inclusion in interface files. Eta expanding during CorePrep</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">proved to be very difficult to predict, leading to nasty inconsistencies in</span></span>

</pre>

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663

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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CAFfyness determinations (see #16846).</span></span>

</pre>

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664

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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"></span>

</pre>

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617

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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Nota Bene: GHC.PrimopWrappers is needed *regardless*, because it's</span></span>

</pre>

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618

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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">used by GHCi, which does not implement primops direct at all.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thankfully, we now no longer try to predict CAFfyness but rather compute it on</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="666" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

666

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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC STG (see Note [SRTs] in GHC.Cmm.Info.Build) and inject it into the interface</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="667" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

667

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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">file after code generation (see TODO: Refer to whatever falls out of #18096).</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="668" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

668

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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is much simpler and avoids the potential for inconsistency, allowing us to</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="669" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

669

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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">return to the somewhat simpler eta expansion approach for unsaturated primops.</span></span>

</pre>

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619

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<td class="diff-line-num new_line" data-linenumber="670" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

670

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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="671" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

671

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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See #18079.</span></span>

</pre>

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620

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672

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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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621

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673

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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="622" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

622

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<td class="diff-line-num new_line" data-linenumber="674" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

674

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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"><span class="cd">-- | Returns the 'Id' of the wrapper associated with the given 'PrimOp'.</span></span>

</pre>

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<li id="11e6f6a348be9920cecad0893a25350137524b4f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#11e6f6a348be9920cecad0893a25350137524b4f"><strong>compiler/GHC/ByteCode/Linker.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="176" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="176" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -176,6 +176,7 @@ nameToCLabel n suffix = mkFastString label</td>

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176

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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell">        <span class="p">]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

177

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177

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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

178

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<td class="diff-line-num new_line" data-linenumber="178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

178

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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

179

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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Primop wrappers] in GHC.Builtin.PrimOps</span></span>

</pre>

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179

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<td class="diff-line-num new_line" data-linenumber="180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

180

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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">primopToCLabel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>

</pre>

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180

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<td class="diff-line-num new_line" data-linenumber="181" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

181

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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">primopToCLabel</span> <span class="n" style="color: #333;">primop</span> <span class="n" style="color: #333;">suffix</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concat</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="181" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

181

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<td class="diff-line-num new_line" data-linenumber="182" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

182

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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell">    <span class="p">[</span> <span class="s" style="color: #d14;">"ghczmprim_GHCziPrimopWrappers_"</span></span>

</pre>

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<br>

</li>

<li id="d79a8a61508cb6c5f38a23ab2b691bb77306f672">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#d79a8a61508cb6c5f38a23ab2b691bb77306f672"><strong>compiler/GHC/CoreToStg.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -539,12 +539,10 @@ coreToStgApp f args ticks = do</td>

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<td class="diff-line-num old_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

539

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<td class="diff-line-num new_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

539

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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell">                                      <span class="p">(</span><span class="n" style="color: #333;">dropRuntimeRepArgs</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">tyConAppArgs_maybe</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)))</span></span>

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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- Some primitive operator that might be implemented as a library call.</span></span>

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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- As described in Note [Primop wrappers] in GHC.Builtin.PrimOps, here we</span></span>

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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- turn unsaturated primop applications into applications of</span></span>

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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- the primop's wrapper.</span></span>

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<pre style="margin: 0;">-<span id="LC545" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="n" style="color: #333;">op</span></span>

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<pre style="margin: 0;">-<span id="LC546" class="line" lang="haskell">                  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">saturated</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgPrimOp</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell">                  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StgApp</span> <span class="p">(</span><span class="n" style="color: #333;">primOpWrapperId</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span></span>

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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- As noted by Note [Eta expanding primops] in GHC.Builtin.PrimOps</span></span>

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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- we require that primop applications be saturated.</span></span>

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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="n" style="color: #333;">op</span>      <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">saturated</span> <span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell">                                    <span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgPrimOp</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- A call to some primitive Cmm function.</span></span>

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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">FCallId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CCall</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CCallSpec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StaticTarget</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pkgId</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>

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</li>

<li id="a5d27de4e3111a69f69902c65ecf7b3379f7c49a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#a5d27de4e3111a69f69902c65ecf7b3379f7c49a"><strong>compiler/GHC/CoreToStg/Prep.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -71,7 +71,7 @@ import qualified Data.Set as S</td>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The goal of this pass is to prepare for code generation.</span></span>

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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1.  Saturate constructor applications.</span></span>

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1.  Saturate constructor a<span class="idiff left right">nd primop a</span>pplications.</span></span>

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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2.  Convert to A-normal form; that is, function arguments</span></span>

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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    are always variables.</span></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1067,15 +1067,11 @@ maybeSaturate deals with eta expanding to saturate things that can't deal with</td>

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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unsaturated applications (identified by 'hasNoBinding', currently just</span></span>

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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">foreign calls and unboxed tuple/sum constructors).</span></span>

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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Note that eta expansion in CorePrep is very fragile due to the "prediction" of</span></span></span>

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<pre style="margin: 0;">-<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">CAFfyness made during tidying (see Note [CAFfyness inconsistencies due to eta</span></span></span>

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<pre style="margin: 0;">-<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">expansion in CorePrep] in GHC.Iface.Tidy for details.  </span>We previously saturated primop</span></span>

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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Historical Note: Note that eta expansion in CorePrep used to be very fragile</span></span></span>

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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">due to the "prediction" of CAFfyness that we used to make during tidying.</span></span></span>

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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We previously saturated primop</span></span>

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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications here as well but due to this fragility (see #16846) we now deal</span></span>

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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with this another way, as described in Note [Primop wrappers] in GHC.Builtin.PrimOps.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1075" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's quite likely that eta expansion of constructor applications will</span></span>

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1077

</td>

<td class="diff-line-num new_line old" data-linenumber="1075" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eventually break in a similar way to how primops did. We really should</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1078" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1078

</td>

<td class="diff-line-num new_line old" data-linenumber="1075" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eliminate this case as well.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1079" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1079

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1075

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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1080" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1080

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1076

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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"></span>

</pre>

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1081

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1077

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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"><span class="n" style="color: #333;">maybeSaturate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CpeApp</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqSM</span> <span class="kt" style="color: #458; font-weight: 600;">CpeRhs</span></span>

</pre>

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<br>

</li>

<li id="20aaf8344f379f354fe31dd0c1c4db4ddc5b17aa">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#20aaf8344f379f354fe31dd0c1c4db4ddc5b17aa"><strong>compiler/GHC/Types/Id.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -515,20 +515,12 @@ hasNoBinding :: Id -> Bool</td>

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515

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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Returns @True@ of an 'Id' which may not have a</span></span>

</pre>

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516

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516

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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- binding, even though it is defined in this module.</span></span>

</pre>

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517

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517

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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"></span>

</pre>

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518

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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Data constructor workers used to be things of this kind, but</span></span>

</pre>

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519

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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- they aren't any more.  Instead, we inject a binding for</span></span>

</pre>

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520

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<td class="diff-line-num new_line old" data-linenumber="518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- them at the CorePrep stage.</span></span>

</pre>

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521

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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

522

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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PrimOpId's also used to be of this kind. See Note [Primop wrappers] in GHC.Builtin.PrimOps.</span></span>

</pre>

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523

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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for the history of this.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

524

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<td class="diff-line-num new_line old" data-linenumber="518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="525" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

525

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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that CorePrep currently eta expands things no-binding things and this</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

526

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<td class="diff-line-num new_line old" data-linenumber="518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can cause quite subtle bugs. See Note [Eta expansion of hasNoBinding things</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

527

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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in CorePrep] in CorePrep for details.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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529

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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- EXCEPT: unboxed tuples, which definitely have no binding</span></span>

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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Data constructor workers used to be things of this kind, but they aren't any</span></span>

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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- more.  Instead, we inject a binding for them at the CorePrep stage. The</span></span>

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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exception to this is unboxed tuples and sums datacons, which definitely have</span></span>

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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- no binding</span></span>

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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">hasNoBinding</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">idDetails</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="kr" style="font-weight: 600;">_</span>       <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff">   </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Primop wrapper</span>s] in GHC.Builtin.PrimOps</span></span>

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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">PrimOpId</span> <span class="kr" style="font-weight: 600;">_</span>       <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">True</span></span><span class="idiff">    </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Eta expanding primop</span>s] in GHC.Builtin.PrimOps</span></span>

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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">FCallId</span> <span class="kr" style="font-weight: 600;">_</span>        <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

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533

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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">DataConWorkId</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isUnboxedTupleCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnboxedSumCon</span> <span class="n" style="color: #333;">dc</span></span>

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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell">                        <span class="kr" style="font-weight: 600;">_</span>                <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isCompulsoryUnfolding</span> <span class="p">(</span><span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>

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<br>

</li>

<li id="6fa7e3addcbfb51484d3c10c0e9f76b940dc43bb">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#6fa7e3addcbfb51484d3c10c0e9f76b940dc43bb"><strong>testsuite/tests/codeGen/should_fail/T13233.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -21,9 +21,6 @@ obscure _ = ()</td>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">quux</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span></span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">quux</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">obscure</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It used to be that primops has no binding. However, as described in</span></span>

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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Primop wrappers] in GHC.Builtin.PrimOps we now rewrite unsaturated primop</span></span>

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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- applications to their wrapper, which allows safe use of levity polymorphism.</span></span>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">primop</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span><span class="o" style="font-weight: 600;">.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell">          <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">,</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Weak</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>

</pre>

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</li>

<li id="099b526cfec5ec31d3d6df51fb073d7d9627cc39">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de4c785c49bf99e284f51626b33ea024bfb5862b#099b526cfec5ec31d3d6df51fb073d7d9627cc39"><strong>testsuite/tests/codeGen/should_fail/T13233.stderr</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -20,3 +20,11 @@ T13233.hs:22:16: error:</td>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">    Levity-polymorphic arguments:</span>

</pre>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">      a :: TYPE rep1</span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">      b :: TYPE rep2</span>

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">T13233.hs:27:10: error:</span>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">    Cannot use function with levity-polymorphic arguments:</span>

</pre>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">      mkWeak# :: a</span>

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">                 -> b</span>

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<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">                 -> (State# RealWorld -> (# State# RealWorld, c #))</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">                 -> State# RealWorld</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext">                 -> (# State# RealWorld, Weak# b #)</span></pre>

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